伙计们,我在这个问题上苦苦挣扎,我是使用ajax调用和jdbc相关函数的新手。接下来,我使用ajax函数将datepicker值传递给servlet端,该函数正常工作,我将值打印在随机div中只是为了查看其是否正常工作。现在,我该如何取该值并将其用于准备好的语句中,以根据用户选择的日期来搜索数据库数据,这完全可以做到吗?
这里有一些代码可以添加更多上下文
$.ajax({
type:'POST',
data:{dateinput:dateinput},
url:'/Rest/sales?action=param2',
dataType: 'json',
success:function(result){
$('#altdate').html(result);
},
error: function (error) {
console.log(error);
}
});
});
我有一个带有静态值的准备好的语句,只是为了查看它是否正在工作(它确实起作用),但是在这里我无法取得进展,如何声明该值?
ConnectionPool pool = ConnectionPool.getInstance(DatosGeneral.DATABASE);
Connection connection = pool.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;
String[] ids = null;
double[] prices = null;
try{
String query = "SELECT * FROM [" + GeneralData.DATABASE + "].[dbo].[SalesDetails] "
+ "WHERE [Branch] = '" + GeneralData.bra + "' "
+ "AND [UpDate] = ?" ; //previous value 20190521
System.out.println(query);
ps = connection.prepareStatement(query,
ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
rs = ps.executeQuery();
int rowcount = 0;
if (rs.last()) {
rowcount = rs.getRow();
rs.beforeFirst();
}
ids = new String[rowcount];
prices = new double[rowcount];
for (int i = 0; rs.next(); i++) {
if (rs.getString("Type").replaceAll("\\s+", "").equals("PROD")) {
ids[i] = rs.getString("ProductCode").replaceAll("\\s+", "");
prices[i] = rs.getDouble("Price");
}
}
最近是我在请求参数的dopost函数
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String action= request.getParameter("action");
if(action.equals("param1")){
int i = Integer.parseInt(request.getParameter("branch"));
GeneralData.bra = GeneralData.branches[i];
GeneralData.braName = GeneralData.braNames[i];
System.out.println(GeneralData.bra);
}else if (action.equals("param2")){
String altdate = request.getParameter("dateinput");
PrintWriter out = response.getWriter();
out.print(altdate);
}
任何帮助将不胜感激
好了,我解决了,我唯一要做的就是声明一个变量,我可以在其中存储通过ajax调用传递的值(datepicker的值),并使用doPost方法对其进行分配。像这样的东西:
private String datePickerValue=null;
doPost方法:
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
datePickerValue=altdate;
}
最后,在准备好的语句的查询中,仅指定该变量作为用于从db获取数据的参数:
try{
String query = "SELECT * FROM [" + GeneralData.DATABASE + "].[dbo].[SalesDetails] "
+ "WHERE [Branch] = '" + GeneralData.bra + "' "
+ "AND [UpDate] = '" + datePickerValue +"'" ; //previous value 20190521